Name: Extinguishment of a Diffusion Flame over a PMMA Cylinder by Depressurization in Reduced-Gravity (en Inglés)
SKU: 59903587
Price: 524.86 MXN
Availability: InStock
Author: National Aeronautics and Space Administr ; Goldmeer, Jeffrey Scott
ISBN: 9781288915378

portada Extinguishment of a Diffusion Flame over a PMMA Cylinder by Depressurization in Reduced-Gravity (en Inglés)

Extinguishment of a Diffusion Flame over a PMMA Cylinder by Depressurization in Reduced-Gravity (en Inglés)

Formato

Libro Físico

Autor

National Aeronautics and Space Administr

Jeffrey Scott Goldmeer

Editorial

Biblioscholar

Idioma

Inglés

N° páginas

200

Encuadernación

Tapa Blanda

Dimensiones

24.6x18.9x1.1 cm

Peso

0.37 kg.

ISBN13

9781288915378

Categorías

Educación

Extinguishment of a Diffusion Flame over a PMMA Cylinder by Depressurization in Reduced-Gravity (en Inglés)

National Aeronautics and Space Administr (Autor) · Jeffrey Scott Goldmeer (Autor) · Biblioscholar · Tapa Blanda

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Reseña del libro "Extinguishment of a Diffusion Flame over a PMMA Cylinder by Depressurization in Reduced-Gravity (en Inglés)"

Extinction of a diffusion flame burning over horizontal PMMA (Polymethyl methacrylate) cylinders in low-gravity was examined experimentally and via numerical simulations. Low-gravity conditions were obtained using the NASA Lewis Research Center's reduced-gravity aircraft. The effects of velocity and pressure on the visible flame were examined. The flammability of the burning solid was examined as a function of pressure and the solid-phase centerline temperature. As the solid temperature increased, the extinction pressure decreased, and with a centerline temperature of 525 K, the flame was sustained to 0.1 atmospheres before extinguishing. The numerical simulation iteratively coupled a two-dimensional quasi-steady, gas-phase model with a transient solid-phase model which included conductive heat transfer and surface regression. This model employed an energy balance at the gas/solid interface that included the energy conducted by the gas-phase to the gas/solid interface, Arrhenius pyrolysis kinetics, surface radiation, and the energy conducted into the solid. The ratio of the solid and gas-phase conductive fluxes Phi was a boundary condition for the gas-phase model at the solid-surface. Initial simulations modeled conditions similar to the low-gravity experiments and predicted low-pressure extinction limits consistent with the experimental limits. Other simulations examined the effects of velocity, depressurization rate and Phi on extinction.